phase(N.4) Tasks 22+23: WbDrawDispatcher + surface metadata side-table

WbDrawDispatcher draws all entities through WB's ObjectRenderData
(VAO/VBO per GfxObj, per-batch IBO) using acdream's TextureCache for
texture resolution. Two-pass rendering (opaque+ClipMap, then
translucent) matching the existing InstancedMeshRenderer pattern.
Per-entity single-instance drawing for N.4 simplicity — true
instancing grouping deferred to N.6.

Atlas-tier entities: mesh from WB, texture from TextureCache via
batch SurfaceId. Per-instance-tier entities: AnimatedEntityState
drives part overrides + hidden-parts, palette/surface overrides
resolve through TextureCache's composite-key caches.

Side-table population (Task 23 folded in): WbMeshAdapter now takes
DatCollection and populates AcSurfaceMetadataTable on first
IncrementRefCount per GfxObj. The side-table provides TranslucencyKind
(critical for ClipMap alpha-test on vegetation) plus Luminosity,
Diffuse, SurfOpacity, NeedsUvRepeat, DisableFog for sky-pass and
lighting.

GameWindow wiring: when WbFoundationFlag is enabled, WbDrawDispatcher
draws everything and InstancedMeshRenderer is skipped. Flag-off path
is unchanged.

Matrix composition: restPose * animOverride * entityWorld, matching
the spec. Three MatrixCompositionTests verify the contract.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/AcDream.Core.Tests/Rendering/Wb/WbMeshAdapterTests.cs

@@ -14,7 +14,7 @@ public sealed class WbMeshAdapterTests
         // We can't pass a real GL (no context in tests), so we verify only the
         // null-GL guard. The real pipeline is tested via integration.
         Assert.Throws<ArgumentNullException>(() =>
-            new WbMeshAdapter(gl: null!, datDir: "some/path", logger: NullLogger<WbMeshAdapter>.Instance));
+            new WbMeshAdapter(gl: null!, datDir: "some/path", dats: null!, logger: NullLogger<WbMeshAdapter>.Instance));
     }
 
     [Fact]